Silicone-acrylate impact modifier

Inactive Publication Date: 2004-08-19
GENERAL ELECTRIC CO
View PDF4 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0043] The molding compositions comprising different polymer resins and the silicone-acrylate impact modifier compositions disclosed herein posses superior properties, such as low temperature impact and ductility, as compared to the polymer resin compositions which comprises methyl methacrylate-butadiene-styrene

Problems solved by technology

However, due to the presence of unsaturation, these butadiene-based copolymers respond poorly to weathering.
Impact modifiers based on acrylonitrile-styrene-acrylat-e (also called ASA) copolymers avoid the issues faced by the butadiene-based polymers, however, these

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Silicone-acrylate impact modifier
  • Silicone-acrylate impact modifier
  • Silicone-acrylate impact modifier

Examples

Experimental program
Comparison scheme
Effect test

Example

Example 1

[0050] This Example describes the general procedure for preparing IM-4 silicone-acrylate impact modifier compositions by a semi-continuous emulsion polymerization process without a homogenization step.

[0051] A pre-emulsion mixture was prepared by combining D.sub.4 (95.5 grams), tetraethylorthosilicate (2 grams), MPTMS (2.5 grams), dodecylbenzenesulfonic acid (0.5 grams), sodium dodecylbenzenesulfonate (1 gram), and deionized water (250 grams). About 20 percent by weight of the pre-emulsion mixture was charged together with deionized water (75 grams) into a five-necked reactor equipped with a condenser, nitrogen inlet, and a stirrer, and the resulting mixture was stirred for about 3 hours while maintaining the internal temperature at about 89.degree. C. The remainder of the pre-emulsion mixture was then fed continuously over a 3-hour period with continued stirring. After being stirred for about 2 hours at 89.degree. C., the resulting latex was cooled down to room temperature...

Example

Examples 2-5 and Comparative Examples 1-7

[0056] These examples describe molding composition formulations prepared using various combinations of the thermoplastic resins and the silicone-acrylate impact modifiers described previously. The formulations prepared are shown in Table 1. In the table "NU" means the particular ingredient was not used for making the formulation. These formulations were then used for preparing molding compositions as follows.

[0057] The formulations described above were extruded into pellets using a W&P ZSK25 twin-screw extruder and the conditions shown below.

2 Zone Temperature (Deg C.) Feed Hopper (Zone 1) 100 Zone 2 200 Zone 3 230 Zone 4 240 Zone 5 (Nozzle) 250 Zone 6 260 Die 260

[0058] The pellets were injection molded into test specimens using an Engel 30-ton injection molder and the conditions shown below.

3 Zone Temperature (Deg C.) Feed Hopper (Zone 1) 70 Zone 2 230 Zone 3 245 Zone 4 265 Zone 5 (Nozzle) 255 Mold 40-50

[0059] The properties were measured on...

Example

[0060] Examination of the data shown in Example 2 of Table 2 indicates that the impact modifier prepared using isooctyl acrylate exhibits much better percent ductility at temperatures equal to or lower than -20.degree. C., as compared with the corresponding molded part comprising MBS as the impact modifier (Comparative Example 3), S2001 impact modifier (Comparative Example 2); and n-butyl acrylate impact modifier (Comparative Example 1). Furthermore, the MVR value for the PC-SAN based molding composition comprising isooctyl acrylate is much higher than that comprising MBS (Comparative Example 3), indicating that impact modifiers prepared using isooctyl acrylate confer better processibility when they are incorporated in molding compositions. A higher MVR is desirable for better processibility. Moreover, PC-SAN based molding compositions retain the mechanical properties on par with those shown by molding compositions comprising MBS.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Timeaaaaaaaaaa
Angleaaaaaaaaaa
Angleaaaaaaaaaa
Login to view more

Abstract

A silicone-acrylate impact modifier composition, wherein said impact modifier composition comprises structural units derived from: at least one silicone rubber monomer, a branched acrylate rubber monomer having the formula: wherein R<1 >is selected from hydrogen and C1-C8 linear and branched hydrocarbyl groups; and R<2 >is a branched C3-C16 hydrocarbyl group; a first graft link monomer, a polymerizable alkenyl-containing organic material, and and a second graft link monomer. The silicone-acrylate impact modifier compositions disclosed herein are useful for making molding compositions, which are useful for producing various articles, especially for outdoor applications.

Description

[0001] The disclosure relates generally to silicone-acrylate rubber compositions and their use as impact modifiers in resin molding compositions, particularly those comprising thermoplastic resins. Furthermore, the disclosure also relates to an emulsion polymerization method for making the silicone-acrylate impact modifiers. As used hereinafter, the expressions "silicone-acrylate rubber" and "silicone-acrylate rubber graft hybrid" mean an interpenetrating composite of silicone rubber and polyacrylate rubber, where the silicone rubber and polyacrylate rubber are entangled in an inseparable fashion at the molecular level.[0002] Butadiene-based impact modifiers, such as acrylonitrile-butadiene-s-tyrene (also called ABS) copolymers and methyl methacrylate-butadiene-styr-ene (also called MBS) copolymers have been previously used to improve the impact performance of thermoplastic materials. However, due to the presence of unsaturation, these butadiene-based copolymers respond poorly to we...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C08F283/12C08F285/00C08F290/06C08G77/442C08L33/00C08L35/06C08L43/04C08L51/04C08L51/08C08L55/02
CPCC08F283/12Y10S525/902C08F290/06C08G77/045C08G77/12C08G77/442C08G77/70C08L33/00C08L35/06C08L43/04C08L51/04C08L51/08C08L51/085C08L55/02C08L83/04C08F285/00C08L83/00C08L2666/02C08L2666/04C08L2666/28
Inventor REDDY, POREDDY NARSISUBBAIAH, ALAGARSAMYGUPTA, SAMIKCHATTERJI, PRABHA RANGORATH
Owner GENERAL ELECTRIC CO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap